Subjective measures. Several subjective measures were also used to assess the experience of the participants during the collaboration. Table REF  presents the subjective fluency metric scales that were used. The fluency, contribution, trust and improvement metrics were used as described in [1]}. The positive teammate traits and the alliance were based on [1]} but with some modifications; the cooperative trait was added into the positive team traits and only a subset of the alliance questions were used based on the characteristics of the present study. The safety measure for physical systems was used as suggested in [3]}. Finally, the participants were also asked to evaluate their own improvement over the game (self-improvement - `my performance improved over time').
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